Agreed, it really depends a lot on YOU. That is the biggest factor. If 100 yards is a long shot to you, then your range mindset will be different.
I've shot my 35's at long ranges for decades. Pronghorn Antelope are a true test of long range shooting, as there is really no cover and they can see you for miles. It will make you re-adjust your thinking as to what a normal range shot is. That's why many preach warp 9 flat shooting super-blaster magnums as the minimum for Antelope. I've gotten a lot of funny looks over the years when asked what I'm hunting with, but I don't care. I have 7mm Rem Mags, 30-06's, etc in the safe - but nothing carries easier, and swings up to the shoulder like a 20 in carbine. This hombre has done well for 20+ years with the (lowly so-called short range) 35 Remington at the long range sport of speed goats.
This buck from 2010 was about 250 yards (Remington Model 81 in 35 Rem) with factory Remington Core-lokt 200 grain ammo.
In 2011 I switched to the Hornady Leverevolution ammo and my Marlin 336 in 35 Rem. And I put a LOT of time in getting her dialed in a multiple ranges with that ammo - not cheap - but VERY necessary - a few days shooting prairie dogs helps! Anyway, new ammo, same result.
This one was at just a touch over 275 yards in 2011.
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This 2012 buck was just under 200 yards - seemed closer!
All three of these Antelope were DRT. I did my job, put the round in the boiler room, and the old 35 Rem shut them down.
The key point here is that I'm really comfortable shooting this 35 Rem out to 300-325 yards with the Hornady pointy bullets on deer sized game.
Again the deciding factor is you. I'm just repeating what everyone here has already said - the 35 Rem will "get'r done" as long as you make good hits.
Maybe it's me, but I think there might be something about big bullets at moderate velocities that hit harder in real life than they do on paper . . . . who knew? Well Elmer did, and Taylor did, and a few other guys with similar limited experience.
I've killed elk at 200+ yards with Remington factory loads - but you MUST be putting the hits where they count - not just hitting the animal - hitting the boiler room - or don't take the shot. Practice, practice, practice, and enjoy the looks of disbelief on your buddies faces when you hammer something at 250 yards with your brush gun and it flops over dead.
Regards,
B